Definition of pyrimidine in English:


Syllabification: py·rim·i·dine
Pronunciation: /pəˈriməˌdēn, pī-


  • 1A colorless crystalline compound with basic properties.
    • A heteroaromatic compound; chemical formula: C4H4N2
    More example sentences
    • Second, there is no branch in the pyrimidine synthesis pathway.
    • The URA3 gene is essential for yeast pyrimidine biosynthesis.
    • Our analyses also suggest that the utilization of products of de novo pyrimidine biosynthesis may differ between different cell types.
  • 1.1 (also pyrimidine base) A substituted derivative of this, especially the bases thymine and cytosine present in DNA.
    More example sentences
    • Both of these products involve dimerization of adjacent pyrimidines on the same DNA strand.
    • Purines and pyrimidines are considered as complex molecules themselves because they are never synthesized as such in vivo.
    • Some introns also have a sequence rich in pyrimidines that adds up to 10 additional bases at the 3’ end.


late 19th century: from German Pyrimidin, from pyridine, with the insertion of -im- from imide.

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